Question

Which one is a short day plant?

• A. Brassica campestris
• B. Raphanus sativus
• C. Glycine max
• D. Papaver somniferum

Answer 1

Answer: (C)

Glycine max

Short day plants are those plants that begin flowering when the days are shorter than their critical day length. They require a long period of darkness and a short period of light to flower. Long day plants are those plants that begin flowering when the days are longer than their critical day length. They will flower when they are exposed to a short period of darkness and a long period of light. Long day plants flower in summer and short day plants flower in spring. Examples of short day plants are Glycine max (soyabean), rice, Nicotiana tabacum (tobacco). Examples of long day plants are Brassica campestris (mustard), Raphanus sativus (raddish), Papaver somniferum (opium), Solanum tuberosum (potato).

Thus, the correct answer is option C.